:root {
    --white: #ffffff;
    --off-white: #f8f5f2;
    --paper: #f2ede8;
    --dark-red: #8b0000;
    --crimson: #b30000;
    --red-bright: #cc1111;
    --red-glow: #ff2222;
    --red-pale: #ffeaea;
    --red-muted: #e8c0c0;
    --ink: #1a1a1a;
    --ink-mid: #3d3030;
    --ink-light: #7a6060;
    --border: #e0d0d0;
    --shadow: rgba(139,0,0,0.12);
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    background: var(--off-white);
    color: var(--ink);
    font-family: 'DM Sans', sans-serif;
    min-height: 100vh;
    cursor: crosshair;
  }

  /* ═══════════════════════════════ PAGE LAYOUT ═══ */
  .page-wrapper {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 20px 80px;
  }

/* ── Breadcrumb ───────────────────────────────────── */
.breadcrumb { max-width: 800px; margin: .75rem auto 0; padding: 0 1rem; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .35rem; list-style: none; font-size: .8rem; color: var(--muted); }
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

  /* ═══════════════════════════════ HEADER ═══ */
  .site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
  }
  .logo {
    display: flex;
    align-items: baseline;
    gap: 8px;
  }
  .logo-main {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 2.2rem;
    letter-spacing: 0.06em;
    color: var(--dark-red);
    line-height: 1;
  }
  .logo-sub {
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    color: var(--ink-light);
    letter-spacing: 0.15em;
    text-transform: uppercase;
  }
  .header-badge {
    font-family: 'DM Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--crimson);
    border: 1.5px solid var(--red-muted);
    padding: 4px 10px;
    border-radius: 2px;
    background: var(--red-pale);
  }

  /* ═══════════════════════════════ GAME SHELL ═══ */
  .game-shell {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 4px 32px var(--shadow), 0 1px 4px rgba(0,0,0,0.06);
    margin-bottom: 40px;
    position: relative;
  }

  /* Fullscreen mode — applied via JS class */
  .game-shell.is-fullscreen {
    position: fixed !important;
    inset: 0 !important;
    z-index: 9999 !important;
    width: 100vw !important;
    height: 100vh !important;
    border-radius: 0 !important;
    border: none !important;
    display: flex !important;
    flex-direction: column !important;
    margin: 0 !important;
  }
  .game-shell.is-fullscreen .game-canvas-wrap {
    flex: 1 1 0 !important;
    height: 0 !important;
    min-height: 0 !important;
  }
  .game-shell.is-fullscreen #gameCanvas {
  }

  /* ═══════════════════════════════ TOOLBAR ═══ */
  .toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--paper);
    border-bottom: 1.5px solid var(--border);
    flex-wrap: wrap;
  }
  .toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .toolbar-label {
    font-family: 'DM Mono', monospace;
    font-size: 0.62rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-light);
    white-space: nowrap;
  }

  .mode-btn {
    font-family: 'DM Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    padding: 5px 11px;
    border: 1.5px solid var(--border);
    background: var(--white);
    color: var(--ink-mid);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s;
  }
  .mode-btn:hover { border-color: var(--crimson); color: var(--crimson); }
  .mode-btn.active {
    background: var(--dark-red);
    border-color: var(--dark-red);
    color: #fff;
  }

  .diff-btn {
    font-family: 'DM Mono', monospace;
    font-size: 0.68rem;
    padding: 4px 10px;
    border: 1.5px solid var(--border);
    background: var(--white);
    color: var(--ink-mid);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s;
  }
  .diff-btn:hover { border-color: var(--crimson); }
  .diff-btn.active { background: var(--crimson); border-color: var(--crimson); color: #fff; }

  .toolbar-spacer { flex: 1; }

  .fullscreen-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: 'DM Mono', monospace;
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    padding: 6px 14px;
    background: var(--dark-red);
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    flex-shrink: 0;
    white-space: nowrap;
  }
  .fullscreen-btn:hover { background: var(--crimson); }
  .fullscreen-btn:active { transform: scale(0.97); }
  .fullscreen-btn svg { width: 13px; height: 13px; fill: none; stroke: #fff; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

  /* ═══════════════════════════════ HUD ═══ */
  .hud {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    border-bottom: 1.5px solid var(--border);
  }
  .hud-cell {
    padding: 9px 12px;
    border-right: 1px solid var(--border);
    text-align: center;
  }
  .hud-cell:last-child { border-right: none; }
  .hud-key {
    font-family: 'DM Mono', monospace;
    font-size: 0.55rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--ink-light);
    margin-bottom: 2px;
  }
  .hud-val {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.35rem;
    letter-spacing: 0.04em;
    color: var(--ink);
    line-height: 1;
  }
  .hud-val.accent { color: var(--crimson); }

  /* ═══════════════════════════════ CANVAS ═══ */
  .game-canvas-wrap {
    position: relative;
    height: 420px;
    background: #fcfafa;
    overflow: hidden;
  }
  @media (max-width: 600px) {
    .game-canvas-wrap { height: 320px; }
  }

  #gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
    background: #fcfafa;
  }

  /* Overlay screens */
  .overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(248,245,242,0.96);
    z-index: 10;
    gap: 16px;
    transition: opacity 0.2s;
  }
  .overlay.hidden { display: none; }
  .overlay-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 2.8rem;
    letter-spacing: 0.08em;
    color: var(--dark-red);
    line-height: 1;
  }
  .overlay-sub {
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    color: var(--ink-light);
    text-transform: uppercase;
    text-align: center;
    max-width: 320px;
    line-height: 1.6;
  }
  .overlay-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 4px 0;
  }
  .stat-box {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: 4px;
    padding: 10px 18px;
    text-align: center;
    min-width: 90px;
  }
  .stat-box .sk { font-family:'DM Mono',monospace; font-size:0.55rem; letter-spacing:0.15em; text-transform:uppercase; color:var(--ink-light); }
  .stat-box .sv { font-family:'Bebas Neue',sans-serif; font-size:1.6rem; color:var(--dark-red); }

  .start-btn {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.1rem;
    letter-spacing: 0.12em;
    padding: 12px 40px;
    background: var(--dark-red);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
    box-shadow: 0 2px 14px rgba(139,0,0,0.3);
  }
  .start-btn:hover { background: var(--crimson); box-shadow: 0 4px 20px rgba(139,0,0,0.4); }
  .start-btn:active { transform: scale(0.97); }

  /* ═══════════════════════════════ BOTTOM BAR ═══ */
  .bottom-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    border-top: 1.5px solid var(--border);
    background: var(--paper);
    font-family: 'DM Mono', monospace;
    font-size: 0.62rem;
    color: var(--ink-light);
    letter-spacing: 0.1em;
  }
  .streak-indicator {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--crimson);
    font-weight: 500;
  }
  .streak-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--crimson);
    animation: pulse 1s ease-in-out infinite;
  }
  @keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(0.8)} }

  /* ═══════════════════════════════ ARTICLE ZONE ═══ */
  .article-zone {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 2px 12px var(--shadow);
  }
  .article-header {
    padding: 20px 28px 16px;
    border-bottom: 1.5px solid var(--border);
    background: var(--paper);
  }
  .article-tag {
    font-family: 'DM Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--crimson);
    margin-bottom: 8px;
  }
  .article-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.9rem;
    letter-spacing: 0.04em;
    color: var(--ink);
    line-height: 1.15;
  }
  .article-meta {
    font-family: 'DM Mono', monospace;
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    color: var(--ink-light);
    margin-top: 8px;
  }
  .article-body {
    padding: 24px 28px 32px;
    min-height: 240px;
  }
  .article-body p, .article-body h2, .article-body h3, .article-body ul, .article-body ol {
    margin-bottom: 16px;
  }
  .article-body p {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--ink-mid);
    font-weight: 300;
  }
  .article-body h2 {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    color: var(--dark-red);
    margin-top: 32px;
  }
  .article-body h3 {
    font-family: 'DM Sans', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
    margin-top: 24px;
  }
  .article-body ul, .article-body ol {
    padding-left: 20px;
    color: var(--ink-mid);
    font-size: 0.93rem;
    line-height: 1.8;
    font-weight: 300;
  }
  .article-body li { margin-bottom: 6px; }
  .article-body strong { color: var(--ink); font-weight: 600; }
  .article-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    gap: 12px;
    color: var(--border);
    text-align: center;
  }
  .article-placeholder svg { width: 40px; height: 40px; opacity: 0.4; }
  .article-placeholder p {
    font-family: 'DM Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--ink-light) !important;
    opacity: 0.5;
  }

  /* Mobile tweaks */
  @media (max-width: 600px) {
    .hud { grid-template-columns: repeat(3,1fr); }
    .hud-cell:nth-child(4), .hud-cell:nth-child(5) { display: none; }
    .toolbar { gap: 6px; }
    .overlay-stats { grid-template-columns: repeat(3,1fr); gap: 8px; }
    .stat-box { padding: 8px 10px; min-width: 70px; }
    .article-body, .article-header { padding: 16px; }
    .page-wrapper { padding: 16px 12px 60px; }
  }